Abstract
Abstract The five-parameter approximation is applied to a normal coordinate analysis of the in-plane molecular vibrations of naphthacene. Vibrational frequencies and mean amplitudes of vibration are reported. The mean amplitudes of vibration for the nonbonded CC distances are studied in particular on the basis of data for benzene, naphthalene, anthracene, pyrene, coronene and naphthacene. The distance types are classified, and characteristic values for the mean amplitudes of the corresponding distances in different molecules are detected.
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